arch/arm/mach-socfpga/clock_manager.c - platform/external/u-boot - Gitiles

 /*
  *  Copyright (C) 2013 Altera Corporation <www.altera.com>
  *
  * SPDX-License-Identifier:	GPL-2.0+
  */

 #include <common.h>
 #include <asm/io.h>
 #include <asm/arch/clock_manager.h>

 DECLARE_GLOBAL_DATA_PTR;

 static const struct socfpga_clock_manager *clock_manager_base =
 	(struct socfpga_clock_manager *)SOCFPGA_CLKMGR_ADDRESS;

 static void cm_wait_for_lock(uint32_t mask)
 {
 	register uint32_t inter_val;
 	uint32_t retry = 0;
 	do {
 		inter_val = readl(&clock_manager_base->inter) & mask;
 		if (inter_val == mask)
 			retry++;
 		else
 			retry = 0;
 		if (retry >= 10)
 			break;
 	} while (1);
 }

 /* function to poll in the fsm busy bit */
 static void cm_wait_for_fsm(void)
 {
 	while (readl(&clock_manager_base->stat) & CLKMGR_STAT_BUSY)
 		;
 }

 /*
  * function to write the bypass register which requires a poll of the
  * busy bit
  */
 static void cm_write_bypass(uint32_t val)
 {
 	writel(val, &clock_manager_base->bypass);
 	cm_wait_for_fsm();
 }

 /* function to write the ctrl register which requires a poll of the busy bit */
 static void cm_write_ctrl(uint32_t val)
 {
 	writel(val, &clock_manager_base->ctrl);
 	cm_wait_for_fsm();
 }

 /* function to write a clock register that has phase information */
 static void cm_write_with_phase(uint32_t value,
 				uint32_t reg_address, uint32_t mask)
 {
 	/* poll until phase is zero */
 	while (readl(reg_address) & mask)
 		;

 	writel(value, reg_address);

 	while (readl(reg_address) & mask)
 		;
 }

 /*
  * Setup clocks while making no assumptions about previous state of the clocks.
  *
  * Start by being paranoid and gate all sw managed clocks
  * Put all plls in bypass
  * Put all plls VCO registers back to reset value (bandgap power down).
  * Put peripheral and main pll src to reset value to avoid glitch.
  * Delay 5 us.
  * Deassert bandgap power down and set numerator and denominator
  * Start 7 us timer.
  * set internal dividers
  * Wait for 7 us timer.
  * Enable plls
  * Set external dividers while plls are locking
  * Wait for pll lock
  * Assert/deassert outreset all.
  * Take all pll's out of bypass
  * Clear safe mode
  * set source main and peripheral clocks
  * Ungate clocks
  */

 void cm_basic_init(const struct cm_config * const cfg)
 {
 	uint32_t start, timeout;

 	/* Start by being paranoid and gate all sw managed clocks */

 	/*
 	 * We need to disable nandclk
 	 * and then do another apb access before disabling
 	 * gatting off the rest of the periperal clocks.
 	 */
 	writel(~CLKMGR_PERPLLGRP_EN_NANDCLK_MASK &
 		readl(&clock_manager_base->per_pll.en),
 		&clock_manager_base->per_pll.en);

 	/* DO NOT GATE OFF DEBUG CLOCKS & BRIDGE CLOCKS */
 	writel(CLKMGR_MAINPLLGRP_EN_DBGTIMERCLK_MASK |
 		CLKMGR_MAINPLLGRP_EN_DBGTRACECLK_MASK |
 		CLKMGR_MAINPLLGRP_EN_DBGCLK_MASK |
 		CLKMGR_MAINPLLGRP_EN_DBGATCLK_MASK |
 		CLKMGR_MAINPLLGRP_EN_S2FUSER0CLK_MASK |
 		CLKMGR_MAINPLLGRP_EN_L4MPCLK_MASK,
 		&clock_manager_base->main_pll.en);

 	writel(0, &clock_manager_base->sdr_pll.en);

 	/* now we can gate off the rest of the peripheral clocks */
 	writel(0, &clock_manager_base->per_pll.en);

 	/* Put all plls in bypass */
 	cm_write_bypass(CLKMGR_BYPASS_PERPLL | CLKMGR_BYPASS_SDRPLL |
 			CLKMGR_BYPASS_MAINPLL);

 	/* Put all plls VCO registers back to reset value. */
 	writel(CLKMGR_MAINPLLGRP_VCO_RESET_VALUE &
 	       ~CLKMGR_MAINPLLGRP_VCO_REGEXTSEL_MASK,
 	       &clock_manager_base->main_pll.vco);
 	writel(CLKMGR_PERPLLGRP_VCO_RESET_VALUE &
 	       ~CLKMGR_PERPLLGRP_VCO_REGEXTSEL_MASK,
 	       &clock_manager_base->per_pll.vco);
 	writel(CLKMGR_SDRPLLGRP_VCO_RESET_VALUE &
 	       ~CLKMGR_SDRPLLGRP_VCO_REGEXTSEL_MASK,
 	       &clock_manager_base->sdr_pll.vco);

 	/*
 	 * The clocks to the flash devices and the L4_MAIN clocks can
 	 * glitch when coming out of safe mode if their source values
 	 * are different from their reset value.  So the trick it to
 	 * put them back to their reset state, and change input
 	 * after exiting safe mode but before ungating the clocks.
 	 */
 	writel(CLKMGR_PERPLLGRP_SRC_RESET_VALUE,
 	       &clock_manager_base->per_pll.src);
 	writel(CLKMGR_MAINPLLGRP_L4SRC_RESET_VALUE,
 	       &clock_manager_base->main_pll.l4src);

 	/* read back for the required 5 us delay. */
 	readl(&clock_manager_base->main_pll.vco);
 	readl(&clock_manager_base->per_pll.vco);
 	readl(&clock_manager_base->sdr_pll.vco);


 	/*
 	 * We made sure bgpwr down was assert for 5 us. Now deassert BG PWR DN
 	 * with numerator and denominator.
 	 */
 	writel(cfg->main_vco_base, &clock_manager_base->main_pll.vco);
 	writel(cfg->peri_vco_base, &clock_manager_base->per_pll.vco);
 	writel(cfg->sdram_vco_base, &clock_manager_base->sdr_pll.vco);

 	/*
 	 * Time starts here
 	 * must wait 7 us from BGPWRDN_SET(0) to VCO_ENABLE_SET(1)
 	 */
 	start = get_timer(0);
 	/* timeout in unit of us as CONFIG_SYS_HZ = 1000*1000 */
 	timeout = 7;

 	/* main mpu */
 	writel(cfg->mpuclk, &clock_manager_base->main_pll.mpuclk);

 	/* main main clock */
 	writel(cfg->mainclk, &clock_manager_base->main_pll.mainclk);

 	/* main for dbg */
 	writel(cfg->dbgatclk, &clock_manager_base->main_pll.dbgatclk);

 	/* main for cfgs2fuser0clk */
 	writel(cfg->cfg2fuser0clk,
 	       &clock_manager_base->main_pll.cfgs2fuser0clk);

 	/* Peri emac0 50 MHz default to RMII */
 	writel(cfg->emac0clk, &clock_manager_base->per_pll.emac0clk);

 	/* Peri emac1 50 MHz default to RMII */
 	writel(cfg->emac1clk, &clock_manager_base->per_pll.emac1clk);

 	/* Peri QSPI */
 	writel(cfg->mainqspiclk, &clock_manager_base->main_pll.mainqspiclk);

 	writel(cfg->perqspiclk, &clock_manager_base->per_pll.perqspiclk);

 	/* Peri pernandsdmmcclk */
 	writel(cfg->mainnandsdmmcclk,
 	       &clock_manager_base->main_pll.mainnandsdmmcclk);

 	writel(cfg->pernandsdmmcclk,
 	       &clock_manager_base->per_pll.pernandsdmmcclk);

 	/* Peri perbaseclk */
 	writel(cfg->perbaseclk, &clock_manager_base->per_pll.perbaseclk);

 	/* Peri s2fuser1clk */
 	writel(cfg->s2fuser1clk, &clock_manager_base->per_pll.s2fuser1clk);

 	/* 7 us must have elapsed before we can enable the VCO */
 	while (get_timer(start) < timeout)
 		;

 	/* Enable vco */
 	/* main pll vco */
 	writel(cfg->main_vco_base | CLKMGR_MAINPLLGRP_VCO_EN,
 	       &clock_manager_base->main_pll.vco);

 	/* periferal pll */
 	writel(cfg->peri_vco_base | CLKMGR_MAINPLLGRP_VCO_EN,
 	       &clock_manager_base->per_pll.vco);

 	/* sdram pll vco */
 	writel(cfg->sdram_vco_base | CLKMGR_MAINPLLGRP_VCO_EN,
 	       &clock_manager_base->sdr_pll.vco);

 	/* L3 MP and L3 SP */
 	writel(cfg->maindiv, &clock_manager_base->main_pll.maindiv);

 	writel(cfg->dbgdiv, &clock_manager_base->main_pll.dbgdiv);

 	writel(cfg->tracediv, &clock_manager_base->main_pll.tracediv);

 	/* L4 MP, L4 SP, can0, and can1 */
 	writel(cfg->perdiv, &clock_manager_base->per_pll.div);

 	writel(cfg->gpiodiv, &clock_manager_base->per_pll.gpiodiv);

 #define LOCKED_MASK \
 	(CLKMGR_INTER_SDRPLLLOCKED_MASK  | \
 	CLKMGR_INTER_PERPLLLOCKED_MASK  | \
 	CLKMGR_INTER_MAINPLLLOCKED_MASK)

 	cm_wait_for_lock(LOCKED_MASK);

 	/* write the sdram clock counters before toggling outreset all */
 	writel(cfg->ddrdqsclk & CLKMGR_SDRPLLGRP_DDRDQSCLK_CNT_MASK,
 	       &clock_manager_base->sdr_pll.ddrdqsclk);

 	writel(cfg->ddr2xdqsclk & CLKMGR_SDRPLLGRP_DDR2XDQSCLK_CNT_MASK,
 	       &clock_manager_base->sdr_pll.ddr2xdqsclk);

 	writel(cfg->ddrdqclk & CLKMGR_SDRPLLGRP_DDRDQCLK_CNT_MASK,
 	       &clock_manager_base->sdr_pll.ddrdqclk);

 	writel(cfg->s2fuser2clk & CLKMGR_SDRPLLGRP_S2FUSER2CLK_CNT_MASK,
 	       &clock_manager_base->sdr_pll.s2fuser2clk);

 	/*
 	 * after locking, but before taking out of bypass
 	 * assert/deassert outresetall
 	 */
 	uint32_t mainvco = readl(&clock_manager_base->main_pll.vco);

 	/* assert main outresetall */
 	writel(mainvco | CLKMGR_MAINPLLGRP_VCO_OUTRESETALL_MASK,
 	       &clock_manager_base->main_pll.vco);

 	uint32_t periphvco = readl(&clock_manager_base->per_pll.vco);

 	/* assert pheriph outresetall */
 	writel(periphvco | CLKMGR_PERPLLGRP_VCO_OUTRESETALL_MASK,
 	       &clock_manager_base->per_pll.vco);

 	/* assert sdram outresetall */
 	writel(cfg->sdram_vco_base | CLKMGR_MAINPLLGRP_VCO_EN|
 		CLKMGR_SDRPLLGRP_VCO_OUTRESETALL,
 		&clock_manager_base->sdr_pll.vco);

 	/* deassert main outresetall */
 	writel(mainvco & ~CLKMGR_MAINPLLGRP_VCO_OUTRESETALL_MASK,
 	       &clock_manager_base->main_pll.vco);

 	/* deassert pheriph outresetall */
 	writel(periphvco & ~CLKMGR_PERPLLGRP_VCO_OUTRESETALL_MASK,
 	       &clock_manager_base->per_pll.vco);

 	/* deassert sdram outresetall */
 	writel(cfg->sdram_vco_base | CLKMGR_MAINPLLGRP_VCO_EN,
 	       &clock_manager_base->sdr_pll.vco);

 	/*
 	 * now that we've toggled outreset all, all the clocks
 	 * are aligned nicely; so we can change any phase.
 	 */
 	cm_write_with_phase(cfg->ddrdqsclk,
 			    (uint32_t)&clock_manager_base->sdr_pll.ddrdqsclk,
 			    CLKMGR_SDRPLLGRP_DDRDQSCLK_PHASE_MASK);

 	/* SDRAM DDR2XDQSCLK */
 	cm_write_with_phase(cfg->ddr2xdqsclk,
 			    (uint32_t)&clock_manager_base->sdr_pll.ddr2xdqsclk,
 			    CLKMGR_SDRPLLGRP_DDR2XDQSCLK_PHASE_MASK);

 	cm_write_with_phase(cfg->ddrdqclk,
 			    (uint32_t)&clock_manager_base->sdr_pll.ddrdqclk,
 			    CLKMGR_SDRPLLGRP_DDRDQCLK_PHASE_MASK);

 	cm_write_with_phase(cfg->s2fuser2clk,
 			    (uint32_t)&clock_manager_base->sdr_pll.s2fuser2clk,
 			    CLKMGR_SDRPLLGRP_S2FUSER2CLK_PHASE_MASK);

 	/* Take all three PLLs out of bypass when safe mode is cleared. */
 	cm_write_bypass(0);

 	/* clear safe mode */
 	cm_write_ctrl(readl(&clock_manager_base->ctrl) | CLKMGR_CTRL_SAFEMODE);

 	/*
 	 * now that safe mode is clear with clocks gated
 	 * it safe to change the source mux for the flashes the the L4_MAIN
 	 */
 	writel(cfg->persrc, &clock_manager_base->per_pll.src);
 	writel(cfg->l4src, &clock_manager_base->main_pll.l4src);

 	/* Now ungate non-hw-managed clocks */
 	writel(~0, &clock_manager_base->main_pll.en);
 	writel(~0, &clock_manager_base->per_pll.en);
 	writel(~0, &clock_manager_base->sdr_pll.en);

 	/* Clear the loss of lock bits (write 1 to clear) */
 	writel(CLKMGR_INTER_SDRPLLLOST_MASK | CLKMGR_INTER_PERPLLLOST_MASK |
 	       CLKMGR_INTER_MAINPLLLOST_MASK,
 	       &clock_manager_base->inter);
 }

 static unsigned int cm_get_main_vco_clk_hz(void)
 {
 	uint32_t reg, clock;

 	/* get the main VCO clock */
 	reg = readl(&clock_manager_base->main_pll.vco);
 	clock = cm_get_osc_clk_hz(1);
 	clock /= ((reg & CLKMGR_MAINPLLGRP_VCO_DENOM_MASK) >>
 		  CLKMGR_MAINPLLGRP_VCO_DENOM_OFFSET) + 1;
 	clock *= ((reg & CLKMGR_MAINPLLGRP_VCO_NUMER_MASK) >>
 		  CLKMGR_MAINPLLGRP_VCO_NUMER_OFFSET) + 1;

 	return clock;
 }

 static unsigned int cm_get_per_vco_clk_hz(void)
 {
 	uint32_t reg, clock = 0;

 	/* identify PER PLL clock source */
 	reg = readl(&clock_manager_base->per_pll.vco);
 	reg = (reg & CLKMGR_PERPLLGRP_VCO_SSRC_MASK) >>
 	      CLKMGR_PERPLLGRP_VCO_SSRC_OFFSET;
 	if (reg == CLKMGR_VCO_SSRC_EOSC1)
 		clock = cm_get_osc_clk_hz(1);
 	else if (reg == CLKMGR_VCO_SSRC_EOSC2)
 		clock = cm_get_osc_clk_hz(2);
 	else if (reg == CLKMGR_VCO_SSRC_F2S)
 		clock = cm_get_f2s_per_ref_clk_hz();

 	/* get the PER VCO clock */
 	reg = readl(&clock_manager_base->per_pll.vco);
 	clock /= ((reg & CLKMGR_PERPLLGRP_VCO_DENOM_MASK) >>
 		  CLKMGR_PERPLLGRP_VCO_DENOM_OFFSET) + 1;
 	clock *= ((reg & CLKMGR_PERPLLGRP_VCO_NUMER_MASK) >>
 		  CLKMGR_PERPLLGRP_VCO_NUMER_OFFSET) + 1;

 	return clock;
 }

 unsigned long cm_get_mpu_clk_hz(void)
 {
 	uint32_t reg, clock;

 	clock = cm_get_main_vco_clk_hz();

 	/* get the MPU clock */
 	reg = readl(&clock_manager_base->altera.mpuclk);
 	clock /= (reg + 1);
 	reg = readl(&clock_manager_base->main_pll.mpuclk);
 	clock /= (reg + 1);
 	return clock;
 }

 unsigned long cm_get_sdram_clk_hz(void)
 {
 	uint32_t reg, clock = 0;

 	/* identify SDRAM PLL clock source */
 	reg = readl(&clock_manager_base->sdr_pll.vco);
 	reg = (reg & CLKMGR_SDRPLLGRP_VCO_SSRC_MASK) >>
 	      CLKMGR_SDRPLLGRP_VCO_SSRC_OFFSET;
 	if (reg == CLKMGR_VCO_SSRC_EOSC1)
 		clock = cm_get_osc_clk_hz(1);
 	else if (reg == CLKMGR_VCO_SSRC_EOSC2)
 		clock = cm_get_osc_clk_hz(2);
 	else if (reg == CLKMGR_VCO_SSRC_F2S)
 		clock = cm_get_f2s_sdr_ref_clk_hz();

 	/* get the SDRAM VCO clock */
 	reg = readl(&clock_manager_base->sdr_pll.vco);
 	clock /= ((reg & CLKMGR_SDRPLLGRP_VCO_DENOM_MASK) >>
 		  CLKMGR_SDRPLLGRP_VCO_DENOM_OFFSET) + 1;
 	clock *= ((reg & CLKMGR_SDRPLLGRP_VCO_NUMER_MASK) >>
 		  CLKMGR_SDRPLLGRP_VCO_NUMER_OFFSET) + 1;

 	/* get the SDRAM (DDR_DQS) clock */
 	reg = readl(&clock_manager_base->sdr_pll.ddrdqsclk);
 	reg = (reg & CLKMGR_SDRPLLGRP_DDRDQSCLK_CNT_MASK) >>
 	      CLKMGR_SDRPLLGRP_DDRDQSCLK_CNT_OFFSET;
 	clock /= (reg + 1);

 	return clock;
 }

 unsigned int cm_get_l4_sp_clk_hz(void)
 {
 	uint32_t reg, clock = 0;

 	/* identify the source of L4 SP clock */
 	reg = readl(&clock_manager_base->main_pll.l4src);
 	reg = (reg & CLKMGR_MAINPLLGRP_L4SRC_L4SP) >>
 	      CLKMGR_MAINPLLGRP_L4SRC_L4SP_OFFSET;

 	if (reg == CLKMGR_L4_SP_CLK_SRC_MAINPLL) {
 		clock = cm_get_main_vco_clk_hz();

 		/* get the clock prior L4 SP divider (main clk) */
 		reg = readl(&clock_manager_base->altera.mainclk);
 		clock /= (reg + 1);
 		reg = readl(&clock_manager_base->main_pll.mainclk);
 		clock /= (reg + 1);
 	} else if (reg == CLKMGR_L4_SP_CLK_SRC_PERPLL) {
 		clock = cm_get_per_vco_clk_hz();

 		/* get the clock prior L4 SP divider (periph_base_clk) */
 		reg = readl(&clock_manager_base->per_pll.perbaseclk);
 		clock /= (reg + 1);
 	}

 	/* get the L4 SP clock which supplied to UART */
 	reg = readl(&clock_manager_base->main_pll.maindiv);
 	reg = (reg & CLKMGR_MAINPLLGRP_MAINDIV_L4SPCLK_MASK) >>
 	      CLKMGR_MAINPLLGRP_MAINDIV_L4SPCLK_OFFSET;
 	clock = clock / (1 << reg);

 	return clock;
 }

 unsigned int cm_get_mmc_controller_clk_hz(void)
 {
 	uint32_t reg, clock = 0;

 	/* identify the source of MMC clock */
 	reg = readl(&clock_manager_base->per_pll.src);
 	reg = (reg & CLKMGR_PERPLLGRP_SRC_SDMMC_MASK) >>
 	      CLKMGR_PERPLLGRP_SRC_SDMMC_OFFSET;

 	if (reg == CLKMGR_SDMMC_CLK_SRC_F2S) {
 		clock = cm_get_f2s_per_ref_clk_hz();
 	} else if (reg == CLKMGR_SDMMC_CLK_SRC_MAIN) {
 		clock = cm_get_main_vco_clk_hz();

 		/* get the SDMMC clock */
 		reg = readl(&clock_manager_base->main_pll.mainnandsdmmcclk);
 		clock /= (reg + 1);
 	} else if (reg == CLKMGR_SDMMC_CLK_SRC_PER) {
 		clock = cm_get_per_vco_clk_hz();

 		/* get the SDMMC clock */
 		reg = readl(&clock_manager_base->per_pll.pernandsdmmcclk);
 		clock /= (reg + 1);
 	}

 	/* further divide by 4 as we have fixed divider at wrapper */
 	clock /= 4;
 	return clock;
 }

 unsigned int cm_get_qspi_controller_clk_hz(void)
 {
 	uint32_t reg, clock = 0;

 	/* identify the source of QSPI clock */
 	reg = readl(&clock_manager_base->per_pll.src);
 	reg = (reg & CLKMGR_PERPLLGRP_SRC_QSPI_MASK) >>
 	      CLKMGR_PERPLLGRP_SRC_QSPI_OFFSET;

 	if (reg == CLKMGR_QSPI_CLK_SRC_F2S) {
 		clock = cm_get_f2s_per_ref_clk_hz();
 	} else if (reg == CLKMGR_QSPI_CLK_SRC_MAIN) {
 		clock = cm_get_main_vco_clk_hz();

 		/* get the qspi clock */
 		reg = readl(&clock_manager_base->main_pll.mainqspiclk);
 		clock /= (reg + 1);
 	} else if (reg == CLKMGR_QSPI_CLK_SRC_PER) {
 		clock = cm_get_per_vco_clk_hz();

 		/* get the qspi clock */
 		reg = readl(&clock_manager_base->per_pll.perqspiclk);
 		clock /= (reg + 1);
 	}

 	return clock;
 }

 unsigned int cm_get_spi_controller_clk_hz(void)
 {
 	uint32_t reg, clock = 0;

 	clock = cm_get_per_vco_clk_hz();

 	/* get the clock prior L4 SP divider (periph_base_clk) */
 	reg = readl(&clock_manager_base->per_pll.perbaseclk);
 	clock /= (reg + 1);

 	return clock;
 }

 static void cm_print_clock_quick_summary(void)
 {
 	printf("MPU       %10ld kHz\n", cm_get_mpu_clk_hz() / 1000);
 	printf("DDR       %10ld kHz\n", cm_get_sdram_clk_hz() / 1000);
 	printf("EOSC1       %8d kHz\n", cm_get_osc_clk_hz(1) / 1000);
 	printf("EOSC2       %8d kHz\n", cm_get_osc_clk_hz(2) / 1000);
 	printf("F2S_SDR_REF %8d kHz\n", cm_get_f2s_sdr_ref_clk_hz() / 1000);
 	printf("F2S_PER_REF %8d kHz\n", cm_get_f2s_per_ref_clk_hz() / 1000);
 	printf("MMC         %8d kHz\n", cm_get_mmc_controller_clk_hz() / 1000);
 	printf("QSPI        %8d kHz\n", cm_get_qspi_controller_clk_hz() / 1000);
 	printf("UART        %8d kHz\n", cm_get_l4_sp_clk_hz() / 1000);
 	printf("SPI         %8d kHz\n", cm_get_spi_controller_clk_hz() / 1000);
 }

 int set_cpu_clk_info(void)
 {
 	/* Calculate the clock frequencies required for drivers */
 	cm_get_l4_sp_clk_hz();
 	cm_get_mmc_controller_clk_hz();

 	gd->bd->bi_arm_freq = cm_get_mpu_clk_hz() / 1000000;
 	gd->bd->bi_dsp_freq = 0;
 	gd->bd->bi_ddr_freq = cm_get_sdram_clk_hz() / 1000000;

 	return 0;
 }

 int do_showclocks(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
 {
 	cm_print_clock_quick_summary();
 	return 0;
 }

 U_BOOT_CMD(
 	clocks,	CONFIG_SYS_MAXARGS, 1, do_showclocks,
 	"display clocks",
 	""
 );
	/*
	* Copyright (C) 2013 Altera Corporation <www.altera.com>
	*
	* SPDX-License-Identifier: GPL-2.0+
	*/

	#include <common.h>
	#include <asm/io.h>
	#include <asm/arch/clock_manager.h>

	DECLARE_GLOBAL_DATA_PTR;

	static const struct socfpga_clock_manager *clock_manager_base =
	(struct socfpga_clock_manager *)SOCFPGA_CLKMGR_ADDRESS;

	static void cm_wait_for_lock(uint32_t mask)
	{
	register uint32_t inter_val;
	uint32_t retry = 0;
	do {
	inter_val = readl(&clock_manager_base->inter) & mask;
	if (inter_val == mask)
	retry++;
	else
	retry = 0;
	if (retry >= 10)
	break;
	} while (1);
	}

	/* function to poll in the fsm busy bit */
	static void cm_wait_for_fsm(void)
	{
	while (readl(&clock_manager_base->stat) & CLKMGR_STAT_BUSY)
	;
	}

	/*
	* function to write the bypass register which requires a poll of the
	* busy bit
	*/
	static void cm_write_bypass(uint32_t val)
	{
	writel(val, &clock_manager_base->bypass);
	cm_wait_for_fsm();
	}

	/* function to write the ctrl register which requires a poll of the busy bit */
	static void cm_write_ctrl(uint32_t val)
	{
	writel(val, &clock_manager_base->ctrl);
	cm_wait_for_fsm();
	}

	/* function to write a clock register that has phase information */
	static void cm_write_with_phase(uint32_t value,
	uint32_t reg_address, uint32_t mask)
	{
	/* poll until phase is zero */
	while (readl(reg_address) & mask)
	;

	writel(value, reg_address);

	while (readl(reg_address) & mask)
	;
	}

	/*
	* Setup clocks while making no assumptions about previous state of the clocks.
	*
	* Start by being paranoid and gate all sw managed clocks
	* Put all plls in bypass
	* Put all plls VCO registers back to reset value (bandgap power down).
	* Put peripheral and main pll src to reset value to avoid glitch.
	* Delay 5 us.
	* Deassert bandgap power down and set numerator and denominator
	* Start 7 us timer.
	* set internal dividers
	* Wait for 7 us timer.
	* Enable plls
	* Set external dividers while plls are locking
	* Wait for pll lock
	* Assert/deassert outreset all.
	* Take all pll's out of bypass
	* Clear safe mode
	* set source main and peripheral clocks
	* Ungate clocks
	*/

	void cm_basic_init(const struct cm_config * const cfg)
	{
	uint32_t start, timeout;

	/* Start by being paranoid and gate all sw managed clocks */

	/*
	* We need to disable nandclk
	* and then do another apb access before disabling
	* gatting off the rest of the periperal clocks.
	*/
	writel(~CLKMGR_PERPLLGRP_EN_NANDCLK_MASK &
	readl(&clock_manager_base->per_pll.en),
	&clock_manager_base->per_pll.en);

	/* DO NOT GATE OFF DEBUG CLOCKS & BRIDGE CLOCKS */
	writel(CLKMGR_MAINPLLGRP_EN_DBGTIMERCLK_MASK \|
	CLKMGR_MAINPLLGRP_EN_DBGTRACECLK_MASK \|
	CLKMGR_MAINPLLGRP_EN_DBGCLK_MASK \|
	CLKMGR_MAINPLLGRP_EN_DBGATCLK_MASK \|
	CLKMGR_MAINPLLGRP_EN_S2FUSER0CLK_MASK \|
	CLKMGR_MAINPLLGRP_EN_L4MPCLK_MASK,
	&clock_manager_base->main_pll.en);

	writel(0, &clock_manager_base->sdr_pll.en);

	/* now we can gate off the rest of the peripheral clocks */
	writel(0, &clock_manager_base->per_pll.en);

	/* Put all plls in bypass */
	cm_write_bypass(CLKMGR_BYPASS_PERPLL \| CLKMGR_BYPASS_SDRPLL \|
	CLKMGR_BYPASS_MAINPLL);

	/* Put all plls VCO registers back to reset value. */
	writel(CLKMGR_MAINPLLGRP_VCO_RESET_VALUE &
	~CLKMGR_MAINPLLGRP_VCO_REGEXTSEL_MASK,
	&clock_manager_base->main_pll.vco);
	writel(CLKMGR_PERPLLGRP_VCO_RESET_VALUE &
	~CLKMGR_PERPLLGRP_VCO_REGEXTSEL_MASK,
	&clock_manager_base->per_pll.vco);
	writel(CLKMGR_SDRPLLGRP_VCO_RESET_VALUE &
	~CLKMGR_SDRPLLGRP_VCO_REGEXTSEL_MASK,
	&clock_manager_base->sdr_pll.vco);

	/*
	* The clocks to the flash devices and the L4_MAIN clocks can
	* glitch when coming out of safe mode if their source values
	* are different from their reset value. So the trick it to
	* put them back to their reset state, and change input
	* after exiting safe mode but before ungating the clocks.
	*/
	writel(CLKMGR_PERPLLGRP_SRC_RESET_VALUE,
	&clock_manager_base->per_pll.src);
	writel(CLKMGR_MAINPLLGRP_L4SRC_RESET_VALUE,
	&clock_manager_base->main_pll.l4src);

	/* read back for the required 5 us delay. */
	readl(&clock_manager_base->main_pll.vco);
	readl(&clock_manager_base->per_pll.vco);
	readl(&clock_manager_base->sdr_pll.vco);


	/*
	* We made sure bgpwr down was assert for 5 us. Now deassert BG PWR DN
	* with numerator and denominator.
	*/
	writel(cfg->main_vco_base, &clock_manager_base->main_pll.vco);
	writel(cfg->peri_vco_base, &clock_manager_base->per_pll.vco);
	writel(cfg->sdram_vco_base, &clock_manager_base->sdr_pll.vco);

	/*
	* Time starts here
	* must wait 7 us from BGPWRDN_SET(0) to VCO_ENABLE_SET(1)
	*/
	start = get_timer(0);
	/* timeout in unit of us as CONFIG_SYS_HZ = 10001000 /
	timeout = 7;

	/* main mpu */
	writel(cfg->mpuclk, &clock_manager_base->main_pll.mpuclk);

	/* main main clock */
	writel(cfg->mainclk, &clock_manager_base->main_pll.mainclk);

	/* main for dbg */
	writel(cfg->dbgatclk, &clock_manager_base->main_pll.dbgatclk);

	/* main for cfgs2fuser0clk */
	writel(cfg->cfg2fuser0clk,
	&clock_manager_base->main_pll.cfgs2fuser0clk);

	/* Peri emac0 50 MHz default to RMII */
	writel(cfg->emac0clk, &clock_manager_base->per_pll.emac0clk);

	/* Peri emac1 50 MHz default to RMII */
	writel(cfg->emac1clk, &clock_manager_base->per_pll.emac1clk);

	/* Peri QSPI */
	writel(cfg->mainqspiclk, &clock_manager_base->main_pll.mainqspiclk);

	writel(cfg->perqspiclk, &clock_manager_base->per_pll.perqspiclk);

	/* Peri pernandsdmmcclk */
	writel(cfg->mainnandsdmmcclk,
	&clock_manager_base->main_pll.mainnandsdmmcclk);

	writel(cfg->pernandsdmmcclk,
	&clock_manager_base->per_pll.pernandsdmmcclk);

	/* Peri perbaseclk */
	writel(cfg->perbaseclk, &clock_manager_base->per_pll.perbaseclk);

	/* Peri s2fuser1clk */
	writel(cfg->s2fuser1clk, &clock_manager_base->per_pll.s2fuser1clk);

	/* 7 us must have elapsed before we can enable the VCO */
	while (get_timer(start) < timeout)
	;

	/* Enable vco */
	/* main pll vco */
	writel(cfg->main_vco_base \| CLKMGR_MAINPLLGRP_VCO_EN,
	&clock_manager_base->main_pll.vco);

	/* periferal pll */
	writel(cfg->peri_vco_base \| CLKMGR_MAINPLLGRP_VCO_EN,
	&clock_manager_base->per_pll.vco);

	/* sdram pll vco */
	writel(cfg->sdram_vco_base \| CLKMGR_MAINPLLGRP_VCO_EN,
	&clock_manager_base->sdr_pll.vco);

	/* L3 MP and L3 SP */
	writel(cfg->maindiv, &clock_manager_base->main_pll.maindiv);

	writel(cfg->dbgdiv, &clock_manager_base->main_pll.dbgdiv);

	writel(cfg->tracediv, &clock_manager_base->main_pll.tracediv);

	/* L4 MP, L4 SP, can0, and can1 */
	writel(cfg->perdiv, &clock_manager_base->per_pll.div);

	writel(cfg->gpiodiv, &clock_manager_base->per_pll.gpiodiv);

	#define LOCKED_MASK \
	(CLKMGR_INTER_SDRPLLLOCKED_MASK \| \
	CLKMGR_INTER_PERPLLLOCKED_MASK \| \
	CLKMGR_INTER_MAINPLLLOCKED_MASK)

	cm_wait_for_lock(LOCKED_MASK);

	/* write the sdram clock counters before toggling outreset all */
	writel(cfg->ddrdqsclk & CLKMGR_SDRPLLGRP_DDRDQSCLK_CNT_MASK,
	&clock_manager_base->sdr_pll.ddrdqsclk);

	writel(cfg->ddr2xdqsclk & CLKMGR_SDRPLLGRP_DDR2XDQSCLK_CNT_MASK,
	&clock_manager_base->sdr_pll.ddr2xdqsclk);

	writel(cfg->ddrdqclk & CLKMGR_SDRPLLGRP_DDRDQCLK_CNT_MASK,
	&clock_manager_base->sdr_pll.ddrdqclk);

	writel(cfg->s2fuser2clk & CLKMGR_SDRPLLGRP_S2FUSER2CLK_CNT_MASK,
	&clock_manager_base->sdr_pll.s2fuser2clk);

	/*
	* after locking, but before taking out of bypass
	* assert/deassert outresetall
	*/
	uint32_t mainvco = readl(&clock_manager_base->main_pll.vco);

	/* assert main outresetall */
	writel(mainvco \| CLKMGR_MAINPLLGRP_VCO_OUTRESETALL_MASK,
	&clock_manager_base->main_pll.vco);

	uint32_t periphvco = readl(&clock_manager_base->per_pll.vco);

	/* assert pheriph outresetall */
	writel(periphvco \| CLKMGR_PERPLLGRP_VCO_OUTRESETALL_MASK,
	&clock_manager_base->per_pll.vco);

	/* assert sdram outresetall */
	writel(cfg->sdram_vco_base \| CLKMGR_MAINPLLGRP_VCO_EN\|
	CLKMGR_SDRPLLGRP_VCO_OUTRESETALL,
	&clock_manager_base->sdr_pll.vco);

	/* deassert main outresetall */
	writel(mainvco & ~CLKMGR_MAINPLLGRP_VCO_OUTRESETALL_MASK,
	&clock_manager_base->main_pll.vco);

	/* deassert pheriph outresetall */
	writel(periphvco & ~CLKMGR_PERPLLGRP_VCO_OUTRESETALL_MASK,
	&clock_manager_base->per_pll.vco);

	/* deassert sdram outresetall */
	writel(cfg->sdram_vco_base \| CLKMGR_MAINPLLGRP_VCO_EN,
	&clock_manager_base->sdr_pll.vco);

	/*
	* now that we've toggled outreset all, all the clocks
	* are aligned nicely; so we can change any phase.
	*/
	cm_write_with_phase(cfg->ddrdqsclk,
	(uint32_t)&clock_manager_base->sdr_pll.ddrdqsclk,
	CLKMGR_SDRPLLGRP_DDRDQSCLK_PHASE_MASK);

	/* SDRAM DDR2XDQSCLK */
	cm_write_with_phase(cfg->ddr2xdqsclk,
	(uint32_t)&clock_manager_base->sdr_pll.ddr2xdqsclk,
	CLKMGR_SDRPLLGRP_DDR2XDQSCLK_PHASE_MASK);

	cm_write_with_phase(cfg->ddrdqclk,
	(uint32_t)&clock_manager_base->sdr_pll.ddrdqclk,
	CLKMGR_SDRPLLGRP_DDRDQCLK_PHASE_MASK);

	cm_write_with_phase(cfg->s2fuser2clk,
	(uint32_t)&clock_manager_base->sdr_pll.s2fuser2clk,
	CLKMGR_SDRPLLGRP_S2FUSER2CLK_PHASE_MASK);

	/* Take all three PLLs out of bypass when safe mode is cleared. */
	cm_write_bypass(0);

	/* clear safe mode */
	cm_write_ctrl(readl(&clock_manager_base->ctrl) \| CLKMGR_CTRL_SAFEMODE);

	/*
	* now that safe mode is clear with clocks gated
	* it safe to change the source mux for the flashes the the L4_MAIN
	*/
	writel(cfg->persrc, &clock_manager_base->per_pll.src);
	writel(cfg->l4src, &clock_manager_base->main_pll.l4src);

	/* Now ungate non-hw-managed clocks */
	writel(~0, &clock_manager_base->main_pll.en);
	writel(~0, &clock_manager_base->per_pll.en);
	writel(~0, &clock_manager_base->sdr_pll.en);

	/* Clear the loss of lock bits (write 1 to clear) */
	writel(CLKMGR_INTER_SDRPLLLOST_MASK \| CLKMGR_INTER_PERPLLLOST_MASK \|
	CLKMGR_INTER_MAINPLLLOST_MASK,
	&clock_manager_base->inter);
	}

	static unsigned int cm_get_main_vco_clk_hz(void)
	{
	uint32_t reg, clock;

	/* get the main VCO clock */
	reg = readl(&clock_manager_base->main_pll.vco);
	clock = cm_get_osc_clk_hz(1);
	clock /= ((reg & CLKMGR_MAINPLLGRP_VCO_DENOM_MASK) >>
	CLKMGR_MAINPLLGRP_VCO_DENOM_OFFSET) + 1;
	clock *= ((reg & CLKMGR_MAINPLLGRP_VCO_NUMER_MASK) >>
	CLKMGR_MAINPLLGRP_VCO_NUMER_OFFSET) + 1;

	return clock;
	}

	static unsigned int cm_get_per_vco_clk_hz(void)
	{
	uint32_t reg, clock = 0;

	/* identify PER PLL clock source */
	reg = readl(&clock_manager_base->per_pll.vco);
	reg = (reg & CLKMGR_PERPLLGRP_VCO_SSRC_MASK) >>
	CLKMGR_PERPLLGRP_VCO_SSRC_OFFSET;
	if (reg == CLKMGR_VCO_SSRC_EOSC1)
	clock = cm_get_osc_clk_hz(1);
	else if (reg == CLKMGR_VCO_SSRC_EOSC2)
	clock = cm_get_osc_clk_hz(2);
	else if (reg == CLKMGR_VCO_SSRC_F2S)
	clock = cm_get_f2s_per_ref_clk_hz();

	/* get the PER VCO clock */
	reg = readl(&clock_manager_base->per_pll.vco);
	clock /= ((reg & CLKMGR_PERPLLGRP_VCO_DENOM_MASK) >>
	CLKMGR_PERPLLGRP_VCO_DENOM_OFFSET) + 1;
	clock *= ((reg & CLKMGR_PERPLLGRP_VCO_NUMER_MASK) >>
	CLKMGR_PERPLLGRP_VCO_NUMER_OFFSET) + 1;

	return clock;
	}

	unsigned long cm_get_mpu_clk_hz(void)
	{
	uint32_t reg, clock;

	clock = cm_get_main_vco_clk_hz();

	/* get the MPU clock */
	reg = readl(&clock_manager_base->altera.mpuclk);
	clock /= (reg + 1);
	reg = readl(&clock_manager_base->main_pll.mpuclk);
	clock /= (reg + 1);
	return clock;
	}

	unsigned long cm_get_sdram_clk_hz(void)
	{
	uint32_t reg, clock = 0;

	/* identify SDRAM PLL clock source */
	reg = readl(&clock_manager_base->sdr_pll.vco);
	reg = (reg & CLKMGR_SDRPLLGRP_VCO_SSRC_MASK) >>
	CLKMGR_SDRPLLGRP_VCO_SSRC_OFFSET;
	if (reg == CLKMGR_VCO_SSRC_EOSC1)
	clock = cm_get_osc_clk_hz(1);
	else if (reg == CLKMGR_VCO_SSRC_EOSC2)
	clock = cm_get_osc_clk_hz(2);
	else if (reg == CLKMGR_VCO_SSRC_F2S)
	clock = cm_get_f2s_sdr_ref_clk_hz();

	/* get the SDRAM VCO clock */
	reg = readl(&clock_manager_base->sdr_pll.vco);
	clock /= ((reg & CLKMGR_SDRPLLGRP_VCO_DENOM_MASK) >>
	CLKMGR_SDRPLLGRP_VCO_DENOM_OFFSET) + 1;
	clock *= ((reg & CLKMGR_SDRPLLGRP_VCO_NUMER_MASK) >>
	CLKMGR_SDRPLLGRP_VCO_NUMER_OFFSET) + 1;

	/* get the SDRAM (DDR_DQS) clock */
	reg = readl(&clock_manager_base->sdr_pll.ddrdqsclk);
	reg = (reg & CLKMGR_SDRPLLGRP_DDRDQSCLK_CNT_MASK) >>
	CLKMGR_SDRPLLGRP_DDRDQSCLK_CNT_OFFSET;
	clock /= (reg + 1);

	return clock;
	}

	unsigned int cm_get_l4_sp_clk_hz(void)
	{
	uint32_t reg, clock = 0;

	/* identify the source of L4 SP clock */
	reg = readl(&clock_manager_base->main_pll.l4src);
	reg = (reg & CLKMGR_MAINPLLGRP_L4SRC_L4SP) >>
	CLKMGR_MAINPLLGRP_L4SRC_L4SP_OFFSET;

	if (reg == CLKMGR_L4_SP_CLK_SRC_MAINPLL) {
	clock = cm_get_main_vco_clk_hz();

	/* get the clock prior L4 SP divider (main clk) */
	reg = readl(&clock_manager_base->altera.mainclk);
	clock /= (reg + 1);
	reg = readl(&clock_manager_base->main_pll.mainclk);
	clock /= (reg + 1);
	} else if (reg == CLKMGR_L4_SP_CLK_SRC_PERPLL) {
	clock = cm_get_per_vco_clk_hz();

	/* get the clock prior L4 SP divider (periph_base_clk) */
	reg = readl(&clock_manager_base->per_pll.perbaseclk);
	clock /= (reg + 1);
	}

	/* get the L4 SP clock which supplied to UART */
	reg = readl(&clock_manager_base->main_pll.maindiv);
	reg = (reg & CLKMGR_MAINPLLGRP_MAINDIV_L4SPCLK_MASK) >>
	CLKMGR_MAINPLLGRP_MAINDIV_L4SPCLK_OFFSET;
	clock = clock / (1 << reg);

	return clock;
	}

	unsigned int cm_get_mmc_controller_clk_hz(void)
	{
	uint32_t reg, clock = 0;

	/* identify the source of MMC clock */
	reg = readl(&clock_manager_base->per_pll.src);
	reg = (reg & CLKMGR_PERPLLGRP_SRC_SDMMC_MASK) >>
	CLKMGR_PERPLLGRP_SRC_SDMMC_OFFSET;

	if (reg == CLKMGR_SDMMC_CLK_SRC_F2S) {
	clock = cm_get_f2s_per_ref_clk_hz();
	} else if (reg == CLKMGR_SDMMC_CLK_SRC_MAIN) {
	clock = cm_get_main_vco_clk_hz();

	/* get the SDMMC clock */
	reg = readl(&clock_manager_base->main_pll.mainnandsdmmcclk);
	clock /= (reg + 1);
	} else if (reg == CLKMGR_SDMMC_CLK_SRC_PER) {
	clock = cm_get_per_vco_clk_hz();

	/* get the SDMMC clock */
	reg = readl(&clock_manager_base->per_pll.pernandsdmmcclk);
	clock /= (reg + 1);
	}

	/* further divide by 4 as we have fixed divider at wrapper */
	clock /= 4;
	return clock;
	}

	unsigned int cm_get_qspi_controller_clk_hz(void)
	{
	uint32_t reg, clock = 0;

	/* identify the source of QSPI clock */
	reg = readl(&clock_manager_base->per_pll.src);
	reg = (reg & CLKMGR_PERPLLGRP_SRC_QSPI_MASK) >>
	CLKMGR_PERPLLGRP_SRC_QSPI_OFFSET;

	if (reg == CLKMGR_QSPI_CLK_SRC_F2S) {
	clock = cm_get_f2s_per_ref_clk_hz();
	} else if (reg == CLKMGR_QSPI_CLK_SRC_MAIN) {
	clock = cm_get_main_vco_clk_hz();

	/* get the qspi clock */
	reg = readl(&clock_manager_base->main_pll.mainqspiclk);
	clock /= (reg + 1);
	} else if (reg == CLKMGR_QSPI_CLK_SRC_PER) {
	clock = cm_get_per_vco_clk_hz();

	/* get the qspi clock */
	reg = readl(&clock_manager_base->per_pll.perqspiclk);
	clock /= (reg + 1);
	}

	return clock;
	}

	unsigned int cm_get_spi_controller_clk_hz(void)
	{
	uint32_t reg, clock = 0;

	clock = cm_get_per_vco_clk_hz();

	/* get the clock prior L4 SP divider (periph_base_clk) */
	reg = readl(&clock_manager_base->per_pll.perbaseclk);
	clock /= (reg + 1);

	return clock;
	}

	static void cm_print_clock_quick_summary(void)
	{
	printf("MPU %10ld kHz\n", cm_get_mpu_clk_hz() / 1000);
	printf("DDR %10ld kHz\n", cm_get_sdram_clk_hz() / 1000);
	printf("EOSC1 %8d kHz\n", cm_get_osc_clk_hz(1) / 1000);
	printf("EOSC2 %8d kHz\n", cm_get_osc_clk_hz(2) / 1000);
	printf("F2S_SDR_REF %8d kHz\n", cm_get_f2s_sdr_ref_clk_hz() / 1000);
	printf("F2S_PER_REF %8d kHz\n", cm_get_f2s_per_ref_clk_hz() / 1000);
	printf("MMC %8d kHz\n", cm_get_mmc_controller_clk_hz() / 1000);
	printf("QSPI %8d kHz\n", cm_get_qspi_controller_clk_hz() / 1000);
	printf("UART %8d kHz\n", cm_get_l4_sp_clk_hz() / 1000);
	printf("SPI %8d kHz\n", cm_get_spi_controller_clk_hz() / 1000);
	}

	int set_cpu_clk_info(void)
	{
	/* Calculate the clock frequencies required for drivers */
	cm_get_l4_sp_clk_hz();
	cm_get_mmc_controller_clk_hz();

	gd->bd->bi_arm_freq = cm_get_mpu_clk_hz() / 1000000;
	gd->bd->bi_dsp_freq = 0;
	gd->bd->bi_ddr_freq = cm_get_sdram_clk_hz() / 1000000;

	return 0;
	}

	int do_showclocks(cmd_tbl_t cmdtp, int flag, int argc, char const argv[])
	{
	cm_print_clock_quick_summary();
	return 0;
	}

	U_BOOT_CMD(
	clocks, CONFIG_SYS_MAXARGS, 1, do_showclocks,
	"display clocks",
	""
	);